Composition and Method to Form a Self Decontaminating Surface

• US 20120291667A1
• Filed: 04/16/2012
• Published: 11/22/2012
• Est. Priority Date: 04/15/2011
• Status: Active Grant

• Current Assignee: SRFC Bio Incorporated
• Original Assignee: Allied Bioscience, Inc.
• Inventors: Geoffrion, Charles, Grossman, Craig, Ngo, Mai, Wysocki, Ronald
• Granted Patent: US 9,757,769 B2
• Time in Patent Office: Days
• US Class Current: 106/287.19
• CPC Class Codes: A01N 55/00 Biocides, pest repellants or attractants, or plant growth regulators, containing organic compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen and sulfur containing organo-phosphorus compounds A01N57/00
• CPC Class Codes: A01N 55/02 containing metal atoms
• CPC Class Codes: B05D 1/02 performed by spraying
• CPC Class Codes: B05D 1/04 involving the use of an electrostatic field B05D1/025 and B05D1/14 take precedence
• CPC Class Codes: B05D 2425/01 top layer/ last layer, i.e. first layer from the top surface
• CPC Class Codes: B05D 2601/24 Titanium dioxide, e.g. rutile
• CPC Class Codes: B05D 5/00 Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
• CPC Class Codes: B05D 7/52 Two layers
• CPC Class Codes: C07F 7/28 Titanium compounds
• CPC Class Codes: C08G 77/26 nitrogen-containing groups
• CPC Class Codes: C08G 79/00 Macromolecular compounds obtained by reactions forming a linkage containing atoms other than silicon, sulfur, nitrogen, oxygen, and carbon with or without the latter elements in the main chain of the macromolecule
• CPC Class Codes: C09D 183/08 containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
• CPC Class Codes: C09D 185/00 Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing atoms other than silicon, sulfur, nitrogen, oxygen, and carbon; Coating compositions based on derivatives of such polymers
• CPC Class Codes: C09D 5/00 Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced electrically insulating plastics, resins or waxes H01B3/30; Filling pastes
• CPC Class Codes: C09D 5/14 Paints containing biocides, e.g. fungicides, insecticides or pesticides C09D5/16 takes precedence
• CPC Class Codes: C09D 7/41 Organic pigments; Organic dyes
• CPC Class Codes: D06M 11/46 Oxides or hydroxides of elements of Groups 4 or 14 of the Periodic Table; Titanates; Zirconates; Stannates; Plumbates
• CPC Class Codes: D06M 13/51 Compounds with at least one carbon-metal or carbon-boron, carbon-silicon, carbon-selenium, or carbon-tellurium bond
• CPC Class Codes: D06M 13/513 with at least one carbon-silicon bond
• CPC Class Codes: D06M 15/423 Amino-aldehyde resins
• CPC Class Codes: D06M 23/005 : Applying monomolecular films on textile products like fibres, threads or fabrics

Abstract

A method to prepare a self-decontaminating surface, where that method includes disposing a first coating on a surface, where that first coating comprises an organosilane, and disposing a second coating over the first coating, where the second coating comprises TiO₂.

Claims

1. A method to prepare a self-decontaminating surface, comprising:

disposing a first coating on a surface, said first coating comprising an organosilane;

disposing a second coating over said first coating, said second coating comprising TiO₂.

2. The method of claim 1, wherein said disposing said first coating comprises spraying said organosilane onto said surface.

3. The method of claim 2, wherein said spraying said organosilane comprises spraying an aqueous mixture comprising 3.6 weight percent of said organosilane.

4. The method of claim 1, wherein said disposing said second coating comprises electrostatically spraying said TiO₂ onto said first coating.

5. The method of claim 4, wherein said electrostatically spraying said TiO₂ comprises electrostatically spraying an aqueous 3 percent colloidal suspension of TiO₂.

6. The method of claim 1, wherein said organosilane comprises a structure:

7. The method of claim 6, wherein said organosilane comprises a structure:

8. The method of claim 6, wherein R8 comprises a C18 alkyl chain.

9. The method of claim 8, wherein said organosilane comprises a structure:

10. The method of claim 1, further comprising disposing a pigment in said second coating.

11. The method of claim 10, wherein said pigment can be oxidized by TiO₂.

12. The method of claim 11, wherein said disposing a pigment in said second coating comprises adding said pigment to said TiO₂ immediately prior to said disposing a second coating over said first coating.

13. The method of claim 10, wherein said pigment comprises methylene blue.

14. A coating disposed on a surface, formed by the method of:

dissolving tartaric acid in water;

adding titanium (IV) isopropoxide to said tartaric acid solution to form a tartaric acid/titanium isopropoxide adduct in water;

casting said tartaric acid/titanium isopropoxide adduct in water onto said surface to form said coating.

15. The coating of claim 14, wherein said dissolving step comprises forming a 0.5 molar solution.

16. The coating of claim 14, wherein said method further comprises:

pouring said tartaric acid solution into a round bottom flask; and

placing said round bottom flask into an ice bath.

17. The coating of claim 16, wherein said method further comprises:

removing said round bottom flask from said ice bath after completing said adding step; and

warming said round bottom flask to room temperature; and

forming a gel in said round bottom flask.

18. The coating of claim 17, wherein said casting step comprising casting said gel onto said surface.

19. The coating of claim 14, wherein said tartaric acid/titanium isopropoxide adduct comprising a structure:

20. The coating of claim 14, wherein said tartaric acid/titanium isopropoxide adduct comprising a structure: